Exercise 11.1 Write a simple program to simulate the operation of the the grep command on Unix. Ask the user to enter a regular expression and count the number of lines that matched the regular expression:
$ python grep.pyEnter a regular expression: ˆAuthormbox.txt had 1798 lines that matched ˆAuthor $ python grep.pyEnter a regular expression: ˆXmbox.txt had 14368 lines that matched ˆX- $ python grep.pyEnter a regular expression: java$mbox.txt had 4218 lines that matched java$
Exercise 11.2 Write a program to look for lines of the form
New Revision: 39772
And extract the number from each of the lines using a regular expression and the findall() method. Compute the average of the numbers and print out the average.
Enter file:mbox.txt38549.7949721 Enter file:mbox-short.txt39756.9259259